Improvement in electro-magnetic



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JOSHUA BROOKS, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO I lMS'llL" ANDBENJAMIN E. OORLEW, OF SAME PLACE.

IMPROVEMENT IN ELECTRO-MAGNETIC,AnvERTIsING-FRAME;

-The Schedule referred to in diese Letters Patent and making part of thesame.

To vall whom 'it 'may con cera:

Be it knownthat 1, JOSHUA BROOKS, of Boston, in the eounty of Sublk, andState'oi' Massachu` setts, have invented a new and useful AutomaticElectro-Magnetic Advertising-Oase, of' which the i'ollowing is a full,clear, and exact description, reference being had to the accompanyingdrawings, making a part of this specifica-tion, in which- Figure lrepresents an elevation of the case embodying my invention.

Figure 2 is a vertical transverse section ot' the same.

The same letters refer to the same parts in the dit'- ferent figures.

rlhe object ot' my invention is to produce an adi vertising orshow-case, for the purpose of bringing business-cards or samples, in anoveland prominent way, 'before the public, and thus call attention tothe sanie further, to present to view a large number ofadvertising-cards successively, andiyet occupying but veryl-ttle spacecompared witltthemode of exhibiting show or advertising-cards ininconveniently large frames, thus enabling the observerto have the cardspass by his sight without' changinghis position, or even the directionof his eyes;l and 4My invention consists infrolling np` and unrollingupon tw'o rollers, alternately, a large band, ofvpaper or othermaterial, to which is atrached a number of advertising orbusiness-cards, .said rollers` to bc set in motion by means ofanelectro-magnetic apparatus, or other motive-power, as gravity orelastieityx' To facilitate the understanding of this apparatus,`

I will divide the same. into three different distinct operations whichit performs, and describe itin that order: f 1 i lsirst, the Working ofthe electro-magnets ;l Second, the manner of' revolving the drums whichmove the band along; and

Third, the releasing of `the drums, and 'the reversing ot' theirmotions.

Referring to the drawings A is ,a closed ease, the front side of whichis covered by a glass.

' I n the lower portion of' caseA is placed the battery B, from whichconductors a: and y, charged with the opposing currents, are led to aplatform cont-ailling the two insulators u, a', upon which plays thearmature C,vib1ating from or toward the magnets l) D and E E', which maybe operated in the usual lilllllllCl.

\Vlien one of the pawls q is in contact with the ratchet, it will rotatethe latter with drum 1I, and, therefore, roll up the band on the latter,while, at the same time, thef'pawl y is thrown ofi' thc ratchet, andthus the drum ll is free to pay out the band.

To regulate the motions of the free rollers, a tension is applied to therims F l1` oi' the drums bymeans ofsprings R- E.

The third operation, performing the reverse motion of the band o, ise'ecied in the following manner:

The band o is att-ached to drums H 1:1 by means of straps q, providedwith studs p', in such a manner,y that when the band o is woundaroundthc drum, the stud p will lit into a recess of drums H ll, and notpresent any obstacle in the-winding ofthe band; but, when the band ispayed out, the stud will also be drawn out to the extent of strap q, andpush against arm 'm' of a bell-crank lever, thus throwing up the other,l', and, with it, the' bar 'L'.

Theupper end of bar o is bent, or provided with a, pin, so as to holdthe wire s oibalance-ball i', forming apart of pawl f', in the positionout of gear of the ratchet h'; but, by the upward motion of bari', thebalance-weight 'i will be released, and, dropping downward, bringspawlj" in Contact with ratchet, while, at

the same time, by substantially like arrangements, the

'lherei'ore, the Y pawl f 4 is thrown cti' the. ratchet. drum' H will beset in motion in an opposite direction, and drum H, released fromtheraction of pawlf, is allowed to pay ont the band o in the reversedmotion.

To use the wholelengt'n of the case, the band may I be girded overrollers n n'.

Thus, it will be seen that the band provided with cards will pass downuntil drum Il has payed out tle whole length ofthe same, when, by asimple antomatic operation, the motion is reversed, and the band drawnupward; and this operation will be continued as long as the battery isactive.

That I claim as new, and desire to secure by Letters Patent, is-

1. Drums H H', ratchets h h', pawls lg g', bellc-rank e f', c f, andbars (l d', in combination with an electro-magnetic apparatus,substantially as described.

2. Drum H, strap q, stud p,'in combination with bell-crank lever 'm' l,rod c, wire s,'ball li, and pawl g, substantially as described.

In testimony whereof,I have signed my name to this speeilication, in thepresence of two subscribing witnesses.

JOSHUA BROOKS.

\Vitnesscs:

CARROLL l). WmGnT, Ars'rlx S. Howalrru.

